$(2$e Marks$)$ Answer the follewing:

A firm has too plants with con funcrions $C_1(y_1)=3y_1^2$ and $C_2(y_2)=y_1^2$ what is the cous functione for the firm?

ii$.$ A firm has a produxtion function $y=x_1{x}_2.$ If the minimuis cout ef prodaction at $w_3=w_2=1$ in equal in $.4.$ what is y equal to$?$